| Term What does star formation generally occur from? | Definition the cores of giant molecular clouds |
|---|---|
| Term What are the four factors that resist the collapse of a cloud? | Definition 1. thermal energy (pressure) 2. magnetic fields 3. rotation 4. turbulance |
| Term What is another word for rotation? | Definition angular momentum |
How do stars form from the interstellar medium?
Stars are born in the interstellar medium by the gravitational collapse of gas and dust within interstellar molecular clouds which have mass many times greater than the mass of a single star.
What are the factors that affect star formation at present?
In detail, though, the star formation rate depends on many other factors, including the temperature of the gas, turbulent motions, the gravitational potential of the surroundings, magnetic effects, ionizing photons from nearby stars, and more.
When a large interstellar cloud collapses it usually?
When a large interstellar cloud collapses, it usually does what? Fragments into several smaller clouds which then form stars.
What happens to the temperature in density inside a collapsing protostar quizlet?
What happens to the temperature and density inside a collapsing protostar? Temperature decreases and density increases. Temperature and density both increase.
What affect does a supernova event have on the interstellar medium?
A supernovae creates shock waves through the interstellar medium, compressing the material there, heating it up to millions of degrees. Astronomers believe that these shock waves are vital to the process of star formation, causing large clouds of gas to collapse and form new stars. No supernovae, no new stars.
Which of the following explains the reason that CNO fusion requires a higher temperature than the proto proton chain?
CNO cycle requires higher temperatures than the proton-proton chain so that it can occur only in stars more massive than the Sun. … The more mass a star has, the larger the star’s gravitational force is. More gravity requires more gas pressure to support the star’s weight so the star stays in hydrostatic equilibrium.
What happens when an interstellar cloud fragment shrinks quizlet?
What happens when an interstellar cloud fragment shrinks? It first becomes opaque; Density rises; Temperature rises; Pressure rises. … its luminosity decreases, while its temperature increases.
How do astronomers know that stars and their planetary systems form from concentrations of interstellar material?
Emission nebulae have been shown to contain young stars. … How do astronomers know that stars (and their planetary systems) form from concentrations of interstellar material? They create shock waves that compress the surrounding gas and trigger collapse.
How a star forms from a cloud of molecular hydrogen and why stars typically form in clusters?
Star formation begins when the denser parts of the cloud core collapse under their own weight/gravity. These cores typically have masses around 104 solar masses in the form of gas and dust. … And they occur in clusters, groups of stars that form from the same cloud core.
How does the solar nebula theory explain the formation of the Earth’s solar system?
Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. With the rise of the sun, the remaining material began to clump together.What is nebula cloud theory?
Currently the best theory is the Nebular Theory . This states that the solar system developed out of an interstellar cloud of dust and gas, called a nebula . … The Nebular Theory would have started with a cloud of gas and dust, most likely left over from a previous supernova.
Why does the solar nebula theory predicts that the planetary systems are common?
“Nebular theory”: planets form from the cloud (“nebula”) of cool debris surrounding a forming star. The theory was first described in 1755 by philosopher Immanuel Kant. This would imply planets are common because they are byproducts of normal star formation.
Why doesn’t gravity immediately cause the collapse of all interstellar clouds?
Often, gravity wins — for example, in star-forming regions. But this doesn’t happen immediately. … But for gravity to win, the collapsing gas cloud must get rid of its heat pressure. It does this by converting the heat (due to the random motions of the gas molecules) into radiation, which can escape the cloud.
Is a nebula bigger than a galaxy?
Simply put, the main difference between galaxies and nebulae are an extreme difference in size, as well as their basic structure. A nebula is a cloud of dust and gas, usually tens to hundreds of light years across. A galaxy is much larger — usually thousands to hundreds of thousands of light years across.Is a galaxy bigger than a universe?
Galaxies come in many sizes. The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger. The universe is all of the galaxies – billions of them! … Our Milky Way Galaxy is one among the billions of galaxies in our Universe.What happens when stars explode?
A supernova can shine as brightly as an entire galaxy of billions of “normal” stars. Some of these explosions completely destroy the star, while others leave behind either a super-dense neutron star or a black hole — an object with such powerful gravity that not even light can escape from it.Can a supernova destroy a galaxy?
Supernovas are created during the last moments of a star’s life. These gigantic explosions can wipe out galaxies and the planets inside them. … These powerful eruptions are called supernovae. They can emit the same energy in a single instant that our sun will generate in over 1 million years.Do supernovae create black holes?
Failed supernovae are thought to create stellar black holes by the collapsing of a red supergiant star in the early stages of a supernova. … The observed instances of these disappearances seem to involve supergiant stars with masses above 17 solar masses.
What could trigger the collapse of an interstellar cloud to form protostars?
What are thought to be some possible causes of triggering the contraction of an interstellar cloud? the cloud become too cold to balance the inward force of gravity. From the release of gravitational energy as the protostar shrinks in stages 2 and 3.
